Emery wheel



Jun@ 3, 19m., 1,;496,475

D. F'. MCGOVERN EMERY WHEEL Filed Nov. '7, 1922 Patented .lune 3, i924.

DANIEL FREDRICK MCGOVERN, F MONTPELIER, VERMONT.

EM ERY WHEEL.

Application filled November (I, 1922. Serial No. 599,588.

To all whom it may concern.'

Be it known that I, DANIEL F. MoGovERN, a citizen of the United States,residing at Montpelier, county of Washington, State of Vermont, haveinvented certain'new and useful Improvements in Emery Wheels, of whichthe following is a specification.

This invention relates to emery wheels, and consists in the novelcombination and relation of parts described and illustrated in theaccompanying specication and drawings, and particularly pointed out inthe appended claims.

For the purposes of this application, I shall discuss my improved emerywheel in its adaptation to the stone polishing art, although it will beunderstood that this treatment is purely illustrative and in no waylimiting.

The working face of the ordinary emery wheel is provided with a seriesof spaced concentric solid rings. The abrasive feeds slowly under theserings as the operative moves the emery wheel over the stone, but onaccount of the solid unbroken arrangement of the concentric rings, thefeed of the abrasive is apt to be inadequate, thereby lessening thecutting eillciency-of the ring.

To overcome this objection, the rings have been variously arranged aboutthe working face of the wheel. AIn one characteristic type, the workingface of the wheel is covered by two sets of spaced scrolls and thescrolls of one set terminate between the channels of the opposite scrollset. In another type, the flanges of each set are concentric and thecenters of the sets are laterally spaced from each other to produce thissame result. `While both of the types mentioned have advantages over thesolid ring wheel, neither possesses that degree of cutting elliciencywhich present-day methods demand. i

To the end therefore of providing an emery wheel having an increasedcutting capacity as compared with existing wheels, and which may be morereadily moved back and forth over the stone by the operative, I have'devised my present invention. In it, the working face of the emery wheelis provided with a plurality of radially spaced sets of segmentallanges. The vflanges of each set are concentric, and the spaces betweenthe several sets of flanges constitute radial channels communicatingwith the circumferental channels separating .the ooncentric flanges ofeach set. These radial channels permit the abrasive to 'work from thecenter outwardly towards the periphery of the Wheel as the wheel ismoved over the stone. Certain of the flange sets, moreover, areeccentric to each other so that the flanges of one set do not accuratelytrack the flanges of the adjacent set. This offset arrangement incombination with the radial feed channels results in a constant churningaction whereby the abrasive is scattered over the entire working face ofthe emery wheel. The superior distribution of the abrasive thus obtainedmaterially increases the cutting eiliciency of my emery wheel andpermits it to be more easily manipulated by the operative. In thedrawings:

Fig. l is a bottom plan view of an emery wheel in accordance" with myinvention.

Fig. 2 is a side elevation thereof.

Figs. .3 and 4.- are sections on the line 3-3 and 1 -4, respectively ofFig. 1, and i Fig. 5 is a section on the line 5 5 of Fig. l.

I have indicated at l acircular plate or disc constituting the bodyportion of the emery wheel and at 2 and 3, respectively, broad andnarrow webs which extend radially across the top face of said disc, and,as here shown, divide it into quadrantshaped sectors. b

The periphery of the disc extends as a Continuous unbroken rim. Theinner face of said rim is provided with oppositely disposed offsets orswells 4 which partially fill the channel between said rim and theoutermost flanges of the four spaced sets of segmental flanges whichcover the working face of the wheel shown in the present drawing.

The spaced sets of segmental flanges are indicated by the radii R, R',R2, and R3. All flanges of each set are concentric to and spaced fromeach other to provide intervening circumferentially extending channelsbetween which the abrasive works. The flange sets themselves are spacedfrom each other to provide radial channels 5 along which the abrasivefeeds from the center towards the periphery of the wheel as the wheel ismoved over the stone. Preferably,u the channels 5 lie directly under thewebs 2 and 3.

.As here shown, the flange sets R and R2 have a common center 1 andhence the flanges of said sets are concentric to each other. 'lhe center1" for the flange ASet Rf is laterally olset (to the left in Fig. l)relative to the common center 1a for the sets R and R2 and the centers1l3 for the group R3 is laterally offset (to the right in Fig. l)relative to said center 1". The centers 1" and 1-3 are thus disposed onopposite sides of a plane passing vertically through the center 1. ThisOffset arrangement staggers the flanges of the respective sets relativeto each other so that the yflanges of one set do not accurately trackthe flanges of the adjacent set.

The edges of all the flanges in each set and the inner face of thecontinuous peripheral flange of the disc are beveled, as clearly shownin the sectional views, to facilitate the travel of the abrasive alongthe circumferential channels of the disc and the leading ends of allflanges are preferably sharpened for a similar purpose as regards theradial channels 5 of the disc.

l'n the use of the Wheel, the shallow pocket at the center of the Wheelis brought over the abrasive piled on the stone and the abrasive ispicked up by the flanges and progressively Worked along thecircumferential and radial feed channels 5 towards the periphery of theWheel as the Wheel is moved over the stone. This insures an adequatesupply of abrasive to all of the cutting flanges and by reason of thesuperior distribution of the abrasive thus obtained, the cuttingefiiciency of the Wheel is materially increased.

Various modifications in the form and construction of my device mayobviously be resorted to without departing from the spirit of myinvention if Within the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is:

1. An emery Wheel comprising a disc having on its Working face four setsof spaced concentric flanges R, R', R2 and R3, the

flange sets R and R being disposed on one side of a plane passingtransversely through the center of the disc and the flange sets R2 andR3 being disposed on the opposite side of said plane and all of saidflange sets being radially spaced from each other to provide continuouschannels for the passage of the abrasive extending from the center tothe periphery of the disc, the center 17 for the flange set R beingoffset laterally relative to the center 1 for the flange set R so as tooffset the flanges of said sets R and Rl relative to each other.

2. An emery Wheel comprising a disc having on its Working face four setsof spaced segmental flanges R, R, R2- and R3, all of said ange setsbeing radially spaced from each other to provide continuous channels forthe passage of the abrasive extending from the center to the peripheryof the disc, the flange sets R and R2 having a common center 1' and thecenter 1" and 143 for the flange sets R and R3 being offset laterally oneither side of a plane passing vertically through said common center,and the periphery of the disc extending as a continuous unbroken rim andhaving oppositely disposed offset portions on its inner face extendingpartly into the channel between said rim and the outermost flanges ofthe flange set.

3. In an emery Wheel, a plurality of sector shaped flange sets, theflanges of veach set comprising segments concentric with each other andradially spaced to forni abrasive channels, some of the flange setsbeing concentric With the rotative axis of the wheel and otherseccentric thereto.

In testimony whereof I aflix my signature in presence of two Witnesses.

DANIEL FREDRICK MOGOVERN.

Witnesses:

R. R. PIERCE, R. E. LYoNs.

